Wednesday, February 23, 2022

AirCheck™ SSID AP Troubleshooting

 it is quite common to have several physical access points support the same SSID. Every vendor has its own way of handling handoffs and in most cases, it works pretty well. But what do you do when you suspect one access point is causing an issue?


I don’t care which operating system you are using; it is very difficult to select one physical access point to connect to. I should know, I tried for hours with Android and several Windows applications with no luck.


In this video, a client had an issue where their users complained that they intermittently couldn’t get internet access. That’s when I remembered my previous point. How can I troubleshoot this? In the past, I would physically power off access points to test this theory, but today I had my NetAlly AirCheck G2 and thought I would give it a try.


Fortunately, it was pretty straightforward. I configured my wireless security settings and manually connected to the access points. In the video below you will see that it only took a few minutes to determine that one of the access points was not passing DHCP. It would have taken me about an hour to physically or virtually trace the connections alone.


After some more investigative work, I determined that the access point was a new access point on a VLAN that did not have any DHCP configured. We simply changed the VLAN configuration and, boom, internet.


Of course, I took an extra 10 minutes to confirm that all the access points forwarded DHCP packets, not just the one we worked on.




Monday, February 21, 2022

Nirsoft's WhoisConnected Review

 Thought I would try out this nirsoft.net “who is connected utility” from www.nirsoft.net. I am a big fan of nirsoft because their utilities are specific, small, portable, no ads and support is responsive.


From the readme file

“WhoIsConnectedSniffer (https://www.nirsoft.net/utils/who_is_connected_sniffer.html) is a network discovery tool that listens to network packets on your network adapter using a capture driver (WinpCap or MS network monitor) and accumulates a list of computer and devices currently connected to your network. WhoIsConnectedSniffer uses various protocols to detect the computers connected to your network, including ARP, UDP, DHCP, mDNS, and BROWSER.

For every detected computer or device, the following information is displayed: (Some of the fields might be empty if the information cannot be found inside the packets) IP Address, MAC Address, name of the device/computer, description, Operating System, Network Adapter Company, IPv6 Address.

After collecting the connected computers/devices information, you can easily export the list to tab-delimited/comma-delimited/xml/html file.”


I wanted to see if the software truly listens or if it queries devices to determine more information. So I configured Wireshark with an IP address of a random device – a wireless router acting as an access point and was surprised to see that it send out a Browser Announcement and SMB Domain Enumeration. Why would it do this when I have no storage installed and no protocols configured?





Thursday, February 17, 2022

A Black Box for Everything

 



In the aftermath of a plane crash, one of the first things the accident investigators look for is the flight recorder. Inaptly named the “black box”, it is neither a box, nor is it black – a very bright shade of red is much easier to locate. Recording on a virtual continuous loop, it presumably will have a record of events for the last critical moments of the flight.


Beginning in the 1990’s, the magnetic tape units originally used in flight recorders were replaced by solid state memory boards. Today, the Boeing 787 Dreamliner can log 146,000 separate flight parameters, resulting in several terabytes of data per flight. There is a separate recorder which preserves the last two hours of cockpit audio (crew member expletives included). All this data requires sophisticated analysis software.


Automobile dash cameras, building surveillance cameras and law enforcement body-cams are further examples of how pre-event data logging has infiltrated our lives. Thieves have been apprehended, legal issues have been resolved, and car vandals have been brought to justice using this recorded information. Imagine what a future civilization might think of us if they unearthed all this data.


While it might be satisfying to show the police a video of the person who keyed your expensive car, there are folks who are taking a more expansive view of so-called “Black Box” recording. Climate change is yet another of those divisive issues of our times, and there are those on one side who want to preserve a clear picture of what we humans were doing leading up to what they believe is the inevitable crash of the earth as we know it.


A consortium of like-minded data researchers, architects and artists are putting together a repository that will sit in environmentally and geopolitically safe Tasmania beginning later this year. The original design is intended to last for 50 years, which is longer than the climate clock implies we have left. Work is already underway to extend that life just in case earth outlasts the clock. Three-inch-thick steel walls are meant to protect the archives from whatever might destroy earth, although allowing for visitors to access the information stored in the box remains unsolved.


John Wooden once wrote “The true test of a man’s character is what he does when no one is watching.” Earth’s flight recorder will hold humans accountable for climate change by documenting news articles, scientific journals, tweets, and other assorted records. Land and ocean temperatures will be charted, along with atmospheric greenhouse gas concentrations and biodiversity losses. As a measure of our changing priorities, military spending will be included. It is hoped that an archive of leaders’ climate-conserving efforts will inspire more. Expletives will likely be omitted to conserve storage space.


Some scientists see very little evidence that global warming will result in human extinction, but others remain concerned. How this story ends is anyone’s guess, but all of the events, actions and in-actions will be faithfully recorded in Tasmania.


As pilots say, brace for impact.



Author Profile - Paul W. Smith - leader, educator, technologist, writer - has a lifelong interest in the countless ways that technology changes the course of our journey through life. In addition to being a regular contributor to NetworkDataPedia, he maintains the website Technology for the Journey and occasionally writes for Blogcritics. Paul has over 40 years of experience in research and advanced development for companies ranging from small startups to industry leaders. His other passion is teaching - he is a former Adjunct Professor of Mechanical Engineering at the Colorado School of Mines. Paul holds a doctorate in Applied Mechanics from the California Institute of Technology, as well as Bachelor’s and Master’s Degrees in Mechanical Engineering from the University of California, Santa Barbara.


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